Koteja, Anna, and Jakub Matusik. “Na-Montmorillonite Modified With Ammonium Salts and Azobenzene As a Photoactive Nanomaterial”. Geology, Geophysics and Environment, vol. 42, no. 1, July 2016, p. 87, https://doi.org/10.7494/geol.2016.42.1.87.